#include <iostream>

namespace gebi{
    int old_wang = 80;
}

namespace home{
    int old_wang = 100;
}

using namespace gebi;

int main(int argc, char const *argv[])
{
    std::cout << "old_wang is\t" << old_wang << std::endl;
    std::cout << "old_wang is\t" << home::old_wang << std::endl;
    return 0;
}
